Valve-operating mechanism



Filed Aug. 2'7, 1928 MMZA/m/e J f 190/7 M Patented Nov. 4, 1930 UNITED STATES PATE T-ori ice JOSEPH FERDINAND ADAM, or TORONTO, ONTARIO, CANADA, ASSIGNOR or QNE-HALF) To JOSEPH TESSIER, or TORONTO, ONTARIO, CANADA A VALVE-OPERATING MECHANISM Application filed August 27, 1928. Serial No. 302,372.

My invention relates to improvements in valve operating mechanisms, and object of the invention is to devise a mechanism which in the engine body, and it consists essential-v ly of the arrangement and construction of parts as hereinafter more particularly ex plained.

Fig. 1 represents a sectional view through a portion of an internal combustion engine showing my valve operating mechanism applied thereto.

Fig. 2 is an enlarged sectional detail of the operating cam and the spring device coacting therewith for keeping the parts of the valve mechanism tight during operation.

In the drawing like characters of reference indicate corresponding parts in each figure.

1 indicates a portion of a cylinder, 2 the valve inlet chamber and 3 a portion of the engine block. 4 is the inlet valve provided with the usual stem 5. 6 is a valve lever pivoted at 7 and operated by a push rod 8 j ournalled at its lower end in a vertical bearing 9. 10 is a cam shaft which is driven from any suitable source; 11 is a cam secured on the cam shaft and coacting with the enlarged lower end 8 of the push rod 8.

The heel of the cam is reduced'as indicated at 12, such reduced portion being concentric to the centre of the shaft 10.

13 is the nose of the cam, and 14: and 15 are shoulders formed between the reduced portion 12 and the nose 13. 16 and 17 are slit openings which extend inwardly from the shoulders 14 and 15.

18 is a spring which is in the form of a segment of a circle, the ends of which fit into the slits 16 and 17, such slits being concentric to the centre of the spring and the outer faces 13 and 13 of the nose 18 merge into the surface of the spring '18 so as to produce an even travel of the surface contacting with the cam from the nose to the spring and vice versa. One end of the spring 18 is rigidly secured in a position within the slit opening 16 by a screw pin 19-and the opposite end of the spring is provided with a slot 20 which is located within the slit opening 17 and through which a securing screw 21 extends so as to provide free play for such spring end so that it will move longitudinally when pressure is brought to bear upon the spring or such pressure is relieved therefrom.

In the position shown in the drawing the valve operating mechanism is in the position it assumes when the valve is open. a

As the cam revolves the tendency is for the parts of the mechanism to become loose and form clearance between the cam and rod 8. In order to compensate for this the spring 18 gradually assumes a bearing pressure against the valve mechanism which increases from minimum to maximum and then decreases to minimum to hold the parts tight as the valve opens and closes. a

From this description it will be seen that I have devised a very simple device whereby the actuating parts of valve opening and closing mechanism may be held tight during the opening and closing operation so that there will be no play between the parts, the spring pressuregradually increasing as the valve opens and: decreasing as the valve closes, thus avoiding anynoise or rattle and otherdetrimental eflfects produced thereby.

What I claim as my invention is 1. The combination with a cam body, of a resilient member carried by the cam body and forming the heel portion of the cam.

2. The combination with a cam body, of a spring band carried by the cam body and extending around the heel, of the cam and yieldable under pressure.

3. In a cam, the combination with a cam body having a recess extending around the heel of the cam and a spring band connected to the cam body at each end of the recess, the intermediate portion of which is adapted to cess and having a slotted opposite end, and

d securing means extending into the through the aforesaid slot;

embo y l.

JOSEPH'FERDINAND ADAM. 

